Uncooled protective slag discharge tube

Abstract

A reactor is proposed for entrained flow gasification for operation with pulverized or liquid fuels, with an externally cooled draft tube protecting the slag discharge outlet. An outlet of the draft tube remains above a water line of a sump of the reactor and is formed from Molybdenum, an alloy featuring molybdenum, Tantalum or an alloy featuring Tantalum.

1. A reactor for entrained flow gasification comprising:
 a reaction chamber; 
 a quench chamber connected via a crude gas and slag discharge outlet to the reaction chamber; 
 a sump for collection of water and slag at a bottom of the reactor; 
 an externally cooled draft tube protecting the discharge outlet, wherein an outlet of the draft tube is above a water line of the sump, and the draft tube comprises Molybdenum; and 
 at least one water injection nozzle that injects water into the quench chamber and onto the draft tube to provide external cooling of the draft tube; 
 wherein the externally cooled draft tube is formed from an alloy comprising at least 50 percent Molybdenum in weight percent. 
 
     
     
       2. The reactor as claimed in  claim 1 , wherein the draft tube is not internally cooled by the water.